A radon mitigation system costs $1,200 to $2,000 installed on average per HomeGuide – $1,043 on Angi across 1,184 verified projects – and cuts indoor radon levels by up to 99% per the EPA.1,2,3 The EPA urges action at 4 pCi/L or higher, a level found in about 1 in 15 U.S. homes.2,3*
$1,043
average install, Angi
$1,200 – $2,000
average installed, HomeGuide
up to 99%
radon reduction, EPA
4 pCi/L
EPA action level
Quick math: budget three line items – the system, testing and a permit. On Angi’s numbers that is $805 to $1,326 + $150 to $700 + $25 to $150 = $980 to $2,176 all-in (our math). On HomeGuide’s: $1,200 to $2,000 + $125 to $400 + $25 to $150 = $1,350 to $2,550. A $10 to $30 DIY test kit tells you whether you need any of it.
Published prices at a glance
Two cost references plus the EPA’s official guidance, all fetched and read October 2026:
| Measure | Angi1 | HomeGuide2 | EPA3 |
|---|---|---|---|
| System installed | $805 – $1,326 (avg $1,043) | $1,200 – $2,000 (avg $1,600) | “About the cost of other common home repairs” |
| Active soil depressurization | $1,000 – $3,000 (method table) | $1,200 – $2,000 | Most common fix (per HomeGuide) |
| Passive depressurization | $500 – $2,500 | – | – |
| Basement / foundation sealing | $400 – $4,600 | $6,000 – $18,000 (waterproofing) | – |
| Wall-based system | $500 – $3,000 | $500 – $3,000 | – |
| Ventilation (ERV / HRV) | $1,300 – $2,500 | $1,300 – $2,500 | – |
| Water mitigation | $1,200 – $5,000 | $1,200 – $5,000 | – |
| Crawl space encapsulation | $1,500 – $15,000 | $3,000 – $15,000 | – |
| Professional test | $150 – $700 | $125 – $400 | Test before fixing |
| DIY test kit | – | $10 – $30 | – |
| Permit | $25 – $150 | $25 – $150 | – |
| Fan energy, per year | $100 – $300 | $70 – $80 | – |
Where they disagree: the installed averages sit $550 apart ($1,043 vs $1,600) and pro testing ranges barely overlap ($150 to $700 vs $125 to $400). One caution inside a single source: Angi’s summary quotes active soil depressurization – its own most common method – at $805 to $1,326, while its method table lists the same system at $1,000 to $3,000; treat the true range as roughly $1,000 to $2,000. Basement sealing diverges wildly because the sources mean different jobs: Angi’s $400 to $4,600 is crack sealing, HomeGuide’s $6,000 to $18,000 is full waterproofing.1,2
What pushes the price up
System type: active soil depressurization is the standard fix and the cheapest reliable one; ventilation, water mitigation and crawl space encapsulation climb toward $5,000 to $15,000 when the foundation layout demands them.1,2
Home size and foundation: larger homes add $500 to $1,500 per Angi, and homes without a basement slab may need encapsulation before a system works.1
Region: Angi’s city data runs from $700 in Kansas City to $2,000 in Los Angeles – local radon prevalence, specialist supply and labor rates all move the quote.1
Upkeep: the fan runs continuously ($70 to $300 per year in electricity depending on the source) and typically needs replacement every 5 to 10 years; the piping lasts 20 to 50+ years per HomeGuide.1,2
Three worked examples (we did the math)
| Project | Cost basis | Total |
|---|---|---|
| Typical install, all-in (Angi basis) | system $805 – $1,326 + test $150 – $700 + permit $25 – $150 – our math | $980 – $2,176 |
| Typical install, all-in (HomeGuide basis) | system $1,200 – $2,000 + test $125 – $400 + permit $25 – $150 – our math | $1,350 – $2,550 |
| Ten years of ownership (HomeGuide basis) | system $1,200 – $2,000 + fan energy $70 – $80 x 10 years – our math | $1,900 – $2,800 over a decade |
These are example budgets, not quotes – system type, foundation, home size and region set the real number. Start with a $10 to $30 DIY test kit.
Related guides and tools
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FAQ
How much does a radon mitigation system cost? $1,200 to $2,000 installed on average per HomeGuide, or $1,043 per Angi – plus $125 to $700 for testing and $25 to $150 for a permit depending on the source.1,2
When do I actually need one? The EPA recommends mitigation at 4 pCi/L or higher; a $10 to $30 DIY test kit is the cheap first step, and systems reduce levels by up to 99%.2,3
Can I install it myself? No – Angi is explicit that this is never a DIY project: an incorrectly installed system can compromise your air quality, and real estate transactions generally expect certified professional work.1
Does it cost much to run? The fan uses about as much electricity as a 60-watt bulb – $70 to $80 per year per HomeGuide, $100 to $300 per Angi – and the fan itself lasts 5 to 10 years.1,2
Sources
- Angi – How Much Does a Radon Mitigation System Cost
- HomeGuide – How Much Does a Radon Mitigation System Cost
- US EPA – How Much Can a Radon Mitigation System Cost
*Prices are 2025-2026 national averages from the cited sources and vary by system type, foundation, home size and region. Get at least three itemized quotes.